ArticleThe New phytologist2026
Metacaspases contribute to the cellular response to heat stress in a marine diatom.
Article in The New phytologist, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Climate-driven marine heatwaves (HW) are extreme, large-scale events characterized by elevated ocean temperatures lasting from days to months. Despite their importance, little is known about the molecular mechanisms of algal response to marine HW. Recent studies suggest that metacaspases play an important role in thermotolerance. Metacaspases are cysteine proteases structurally similar to caspases that are best known for their role in programmed cell death. In order to study the role of metacaspases in diatoms' thermotolerance, we exposed the model diatom Phaeodactylum tricornutum and mutants in the metacaspase genes to a 72-h HW followed by a recovery phase that enables capturing the mechanisms underpinning acclimation. PtMCA-III triple mutants exhibited increased sensitivity to the HW treatment, including induction of cell death that peaked days after returning to initial temperatures. We revealed that HW treatment led to accumulation of H
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